thanks Chad, working through it and the parts sheet, I determined it is missing the driver, so searching for one now, too. Also, I cannot figure how to install the small cone ball retainer. I can put loose .220 ball bearings in there, but do not think that is right.
#35, the c-shaped flat spring steel piece that holds the planetary gears onto the gear carrier comes off. Gently expand it to free it from the groove in one of the posts at either end. They're kinda tricky to remove and replace but it and the gears must come off to install the bearing retainer.